TY JOUR TI ASSESSMENT OF ENERGY ACCUMULATION SYSTEM IMPACT UPON VOLTAGE LEVEL ON BUSES OF ACTIVE POINT OF DC SECTIONING KW system KW power supply KW traction substation KW point KW sectioning KW regenerative braking KW accumulation KW voltage KW characteristics JO Bulletin of Bryansk state technical university AU NEZEVAK, V.L. PY 2021 IS 2021 PB Bryansk State Technical University